Hydrometer syringe



Juy 29 1924. ,503,332

J. NELSON HYDROMETER SYRINGE Filed Nov. 5 1923 Ira/@RO 7"! Emmyam lll yatentecl July 29, i924.

JENNINGS NELSON, 0F CHICAGO, ILLINOIS.

HYDROB'IETEB, SYRINGE.

Application filed November r object;

To provide a structural formation and combination of parts in the view portion or transparent barrel of the instrument, by means of which unimpeded movement of the contained hydrometer is attained, and the usual tendency to adhesion or sticking of the hydrometer body to the inner surface of the syringe barrel after a period of actual use is prevented, all as will hereinafter more fully appear.

In the accompanying drawing Fig. l, is a side elevation of a hydrometer syringe to which the present improvement is applied.

Fig. 2, is a detail vertical section of the upper portion of the syringe. i

Fig. 3, is a horizontal section.

Fig. 4, is a perspective view of the preferred form of the guide member of the improvement.

Like reference numerals indicate like parts in the different views.

As represented in the drawing, the syringe comprises a central transparent body portion l of an elongated cylindrical form, provided at its respective ends with out turned lianges or beads for the secure attachment of the upper elastic operating bulb 2, of

rubber or the like, and for a like attachment of the lower exible inlet-outlet tube or nozzle 3. Thel described construction is usual 5, 1923. Serial No. 672,756,

to hydrometer syringes now in general and extended use.

The material part of the present improvementv consists in the arrangement in the interior of the syringe barrel l, of a plurality of longitudinally extending' guide bars or Yra'ilst in Contact with the inner surface of the barrel 1, and preferably formed integral with top and bottom rings 5, to attain proper space relation one to the other. The bars or rails 4 and rings 5 are formed of Celluloid or like resilient material, with said rings 5 slit or gapped at 6, so that the expansion resiliency in the material will tend to press the device closely against the inner surface ofthe barrel l.'

In the present improvement the bars or rails 4f, act in a verv effective manner as guides for the body of the hydrometer in its movement up and down in the syringe barrel l, without liability to the usual surface adhesion of partswhich occurs in the ordinary type of theinstrument.

Having thus fully described my invention what I claim andv desire to secure by Letters Patent, is

1. In a hydrometer syringe, the combination of the central transparent body of the syringe, and a plurality of longitudinal bars integrally connected together by end rings of a fiat band form adapted for frictional holding contact with the inner surface of said transparent body.

2. In a hydrometer syringe, the combination of the central transparent body of the syringe, and a plurality of longitudinal bars integrally connected together by resilient end rings having a gapped form adapted to maintain the parts in contact with `the inner surface of said transparent body.

Signed at Chicago, Illinois, this 2nd day of November 1923.

JENNINGS NELSON. 

